On the worst day ever in British military history, La Boisselle was the worst battlefield. It holds the following records:
- The highest number of casualties on the day – 6,380
- The highest number of soldiers killed – 2,267
- The highest number of Unknown soldiers – 1,927, 85% of the soldiers killed
- The widest piece of No Man’s Land on the Somme battlefront – Mash Valley 800m
- The Lochnagar Mine, which was the largest man-made explosion at that time